Slim 90° Right Angle Head (DK90-BT40 ER Mini Nut Series)

Key Technical Features and Material Standards

• Ultra-Slim Profile & Mini Nut Design: Equipped with M-type mini collet nuts (ER11M, ER16M, ER20M, AER25M) that eliminate protruding wrench flats. This design reduces the maximum swing clearance diameter by up to 35% (down to D55 mm on ER11M models), granting access to narrow slots and deep internal walls.
• High-Rigidity Casing Construction: The main body shell is manufactured from high-strength alloy casting, subjected to stress-relief annealing and cryogenic stabilization. This structure absorbs cutting vibration during deep-reach overhang operations while maintaining thermal stability.
• Gleason Precision Ground Bevel Gears: The drive mechanism utilizes Gleason ground spiral bevel gears in 20CrMnTi Alloy Steel. Carburized and quenched to HRC 58-62 and ground to ISO Grade 4 precision, the gears deliver transmission backlash ≤ 15 arcmin and operational noise ≤ 70 dB under full load.
• Preloaded Precision Bearings: Supported by high-precision P4 class angular contact ball bearings (NSK/FAG), ensuring rigid rotational stability and spindle nose runout ≤ 0.005 mm.

2D/3D Technical Drawings and CAD Download Center

Technical Specifications

Quality Assurance and Testing Standards

Before dispatch, every DK90-BT40 ER Mini Nut series angle head undergoes a 100% Quality Inspection Protocol:

• Static and Dynamic Runout Test: The spindle taper runout is measured with a high-precision dial indicator. Maximum runout is held to ≤ 0.005 mm at the spindle nose and ≤ 0.015 mm at 4D distance.
• 60-Minute Continuous Run-In: Tested continuously at full rated speed for 60 minutes. The housing temperature rise must remain ≤ 25°C above ambient temperature to verify lubrication and gear alignment.
• Anti-Backlash Calibration: Verified with angular encoders to confirm transmission backlash remains ≤ 15 arcminutes.

Target Industries and Industrial Applications

• Deep Mold and Die Cavities: Machining internal side-walls, slider ribs, and angled ejector pin holes in deep mold bases where standard collet nuts collide with the workpiece.
• Aerospace Ribs and Frames: Side slotting, pocketing, and drilling on narrow structural aluminum or titanium frames requiring slim cutter clearance.
• Automotive Engine and Pump Housings: Finishing lateral internal features, valve pockets, and oil passages in complex casting enclosures.

CNC Machine Compatibility

Optimized for medium-to-large Vertical Machining Centers (VMC) and Horizontal Machining Centers (HMC). Compatible spindle interfaces include:

• Spindle Standards: BT40 / BBT40 (Face & Taper double contact) / SK40 / HSK63A.
• Typical Machine Brands: Compatible with Haas, Mazak, Okuma, Doosan / DN Solutions, Makino, and Hurco machine tools.

B2B Industrial Packing and Shipping Standards

• Anti-Rust Protection: Coated with premium anti-rust oil and vacuum-sealed in a heavy-duty VCI (Vapor Corrosion Inhibitor) bag with moisture desiccant packs.
• Shock Absorption: Nestled inside custom-contoured, high-density EPE shockproof foam blocks to prevent shifting or drop impact during courier transport.
• Outer Casing: Packed in an export-grade, double-wall corrugated heavy-duty carton or an ISPM 15-compliant, Fumigation-Free Plywood Case depending on weight requirements.
• HS Code: 8466.10.10.00 or 8466.30.00.90.
• Lead Time: Standard models are shipped within 5-7 working days. Custom positioning blocks (G-distance) are completed and shipped within 15-20 working days.
• Shipment Ports: Shanghai / Ningbo / Tianjin Port, China.
• Incoterms Supported: FOB, CIF, EXW, FCA, DDU, DDP.
• Express Delivery: Shipped via international air couriers (DHL, FedEx, UPS) with delivery to Europe and North America within 3-5 business days.

Technical Setup and Stop Block Alignment Guide

codeText

       ┌──────────────────────────────────────┐
       │     MACHINE TOOL SPINDLE FACE        │
       └──────────────────┬───────────────────┘
                          │ (Spindle Centerline)
                          │ 
                          ▼◄──────  G  ──────►[STOP BLOCK]
                       ┌─────┐                    │
                       │Taper│                    │ (Locking Bore)
                       └─────┘                    ▼
                          │               ┌───────────────┐
                     ┌────┴────┐          │ Positioning   │
                     │  Body   ├──────────┤ Pin (D18/D20) │
                     │  Casing │          └───────────────┘
                     └─────────┘

1. Stop Block Mounting: Securely bolt the dedicated stop block (retaining block) to the front face of the VMC machine spindle.
2. Verify Center Distance (G-Dimension): Confirm that the center-to-center distance between your machine spindle and the positioning pin socket corresponds precisely to your ordered G-Distance (commonly 65mm, 80mm, or 110mm).
3. Indicate Side Runout: Chuck a ground test arbor into the ER mini nut collet. Sweeping a dial indicator along the arbor horizontally, adjust the stop block’s locking bolts until the parallelism is aligned within 0.015 mm per 100mm.
4. Confirm ATC Clearances: Run a manual tool changer (ATC) test cycle at low speed to ensure the automatic arm smoothly grabs, inserts, and releases the BT40 taper without physical interference.

Technical FAQ